How do I make mousedrag inside Panel move form window?

Question

I have this System.Windows.Forms.Panel that I want to enable so that if the user click and drags the mouse drags the window around to.

Can I do this? Do i have to implement multiple events?

Use the panel's MouseMove event. – Hans Passant Jul 07 '12 at 22:42 — Hans Passant, Jul 07 '12 at 22:42

Bravo · Answer 1 · 2013-10-21T11:26:19.153

51

The Solution that works best for me is using unmanaged code, which gives you smooth window movements unlike the answer posted by HatSoft.

3 small steps to drag your window on Panel movement

using System.Runtime.InteropServices;

add these six lines inside your class

public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;

[DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
[DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();

and your MouseMove event on Panel should look like this

private void panel1_MouseMove(object sender, MouseEventArgs e)
{
   if (e.Button == MouseButtons.Left)
   {
      ReleaseCapture();
      SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
   }
}

posted it a little late :) , who knows we might need it again in future.

edited Oct 21 '13 at 11:26

answered Oct 21 '13 at 09:53

Bravo

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e.g. `const int WM_NCLBUTTONDOWN = 0x00A1;` – Rotem Oct 21 '13 at 11:13
oh yes, i missed that, Thanks for pointing that out. :) updated my answer – Bravo Oct 21 '13 at 11:27
3

This should be chosen as the accepted answer. Works like a charm. The current accepted answer has glitches but gives a nudge towards the approach to be taken while solving this problem. – Abhirath Mahipal Sep 28 '16 at 05:01
The accepted answer causes issues when using multiple screens. This should be the accepted answer. Easy to implement and is very smooth – Mark Jun 28 '18 at 15:44
This is really perfect solution. other solution that is accepted is flickering. this is smooth. Also you may give this functionality to the labels and other controls on panel. in my case there was no space on panel to drag. so I give the labels same function from Events tab. – Alp Altunel Apr 12 '20 at 21:03

score 6 · Accepted Answer · answered Jul 07 '12 at 23:34

You can achieve it by using the MouseMove Event of the panel

Example should be something like this (Sorry have not tested it)

private void panel1_MouseMove(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        this.Location = new Point(Cursor.Position.X + e.X , Cursor.Position.Y + e.Y);
    }
}

score 1 · Answer 3 · answered Jul 07 '12 at 23:31

1

You might want to take a look at this component that I pasted here:

http://pastebin.com/5ufJmuay

It is a component that you will be able to drop on a form, and then drag the form by dragging inside it.

answered Jul 07 '12 at 23:31

Daniel Mošmondor

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score 0 · Answer 4 · answered Jan 27 '21 at 00:32

Currently Set For A Panel. VS C# Just Messing About Seems to work for me as I wanted Sets application left-top corner to mouse position while left-click is pressed.

 public form1()
    {
        InitializeComponent();
        this.panel2.MouseMove += new MouseEventHandler(panel2_MouseMove);
    }
    
    public const int WM_NCLBUTTONDOWN = 0xA1;
    public const int HT_CAPTION = 0x2;

    [DllImportAttribute("user32.dll")]
    public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
    
    private void panel2_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            
            Point loc1 = MousePosition;
            this.Location = loc1;
        }
    }

score 0 · Answer 5 · answered May 14 '22 at 12:47

Hey Hope this works for you

First you have to put a panel on your form and dock it to top
Then add these lines of codes


using System.Runtime.InteropServices;

public partial class Main_FM : Form
{

  [DllImport("user32.dll", EntryPoint = "ReleaseCapture")]
    private extern static void ReleaseCapture();

  [DllImport("user32.dll", EntryPoint = "SendMessage")]
    private extern static void SendMessge(System.IntPtr hwnd, int wmsg, int wparam, int lparam);

}

The create the MouseDown event on the panel and add these codes:

 private void Top_PNL_MouseDown(object sender, MouseEventArgs e)
  {
      ReleaseCapture();
      SendMessge(this.Handle, 0x112, 0xf012, 0);
  }

score -1 · Answer 6 · answered May 05 '17 at 20:46

-1

Bravo's code works perfectly fine but I couldn't get this working until i explicitly made MouseMove event enable in panel's->properties->event section of my panel i wanted to move.

answered May 05 '17 at 20:46

Halim

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How do I make mousedrag inside Panel move form window?

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